Valve device

Abstract

The valve device is provided with a valve cavity, a first channel, a main valve port, a pilot valve port, a conduction channel and a pressure equalizing cavity. In the axial direction of the valve device, the valve cavity is located between the pressure equalizing cavity and the first channel, the valve cavity can communicate with the first channel through the main valve port, the valve cavity can communicate with the pressure equalizing cavity through the pilot valve port, and the communicating channel is provided with an opening communicating with the pressure equalizing cavity and an opening communicating with the first channel; the valve device comprises a pilot valve element, a valve rod and a main valve element, the pilot valve element is located in the pressure equalizing cavity, the valve rod and the pilot valve element are fixedly connected or are of an integrated structure, the pilot valve element can open and close the pilot valve port, and the main valve element can move in the valve cavity and can open and close the main valve port; the valve rod can axially move relative to the main valve element. The valve cavity communicates with the pressure equalizing cavity through the pilot valve port, and the valve rod can push the main valve element to move towards the main valve port. By means of the arrangement, the stroke of the pilot valve element is shortened, the axial height of the valve device is reduced, and miniaturization of the valve device is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fluid control, in particular to a valve device. BACKGROUND

[0002] At present, for the pilot valve device in the related art, the pilot valve port is located at the main valve core, the pilot valve core and the main valve core abut at the same time to close the pilot valve port, and when the valve device is in the open valve state, the closing of the pilot valve port will cause the pressure difference on the opposite sides of the main valve core to be unbalanced, resulting in the movement of the main valve core under the action of the pressure difference; therefore, an axial gap needs to be reserved between the pilot valve core and the main valve core in the open valve state to avoid closing the pilot valve port; in the valve closing process, the pilot valve core moves to the pilot valve port by an axial gap to push the main valve core to close the main valve port; the stroke of the pilot valve core is the sum of the stroke of the main valve core and the axial gap between the pilot valve core and the main valve core, and the stroke of the pilot valve core is large in the related art, so how to reduce the stroke of the pilot valve core is a problem. SUMMARY

[0003] The purpose of the present application is to provide a valve device, which is beneficial to reduce the stroke of the pilot valve core, thereby reducing the axial height of the valve device, and further realizing the miniaturization of the valve device.

[0004] To achieve the above-mentioned purpose, an embodiment of the present application adopts the following technical scheme:

[0005] A valve device has a valve cavity, a first channel, a main valve port, a pilot valve port, a pilot channel and an equalizing cavity; along the axial direction of the valve device, the valve cavity is located between the equalizing cavity and the first channel, the valve cavity can communicate with the first channel through the main valve port, the valve cavity can communicate with the equalizing cavity through the pilot valve port, the pilot channel has an opening communicating with the equalizing cavity, and the pilot channel has an opening communicating with the first channel; the valve device comprises a pilot valve core, a valve rod and a main valve core, the pilot valve core is located in the equalizing cavity, the valve rod is fixedly connected with the pilot valve core or is an integral structure, the pilot valve core can open and close the pilot valve port, the main valve core can move in the valve cavity, and the main valve core can open and close the main valve port; at least part of the valve rod is located in the pilot valve port, and the valve rod can move axially relative to the main valve core; when the valve cavity and the equalizing cavity communicate through the pilot valve port, the valve rod can push the main valve core to move towards the main valve port.

[0006] In one technical solution provided in this application, along the axial direction of the valve device, the valve cavity is located between the pressure equalization chamber and the first channel. The valve cavity can communicate with the first channel through the main valve port, and the valve cavity and the pressure equalization chamber can communicate through the pilot valve port. A connecting channel connects the pressure equalization chamber and the first channel. The pilot valve core is located in the pressure equalization chamber, and the valve stem and the pilot valve core are an integral structure. The pilot valve core can open and close the pilot valve port, and the main valve core can move within the valve cavity. The main valve core can open and close the main valve port. The valve stem can move axially relative to the main valve core. The valve cavity and the pressure equalization chamber... When connected through the pilot valve port, the valve stem can push the main valve core to move towards the main valve port. With this configuration, during the process of the pilot valve core closing the pilot valve port, the valve stem first abuts against the main valve core, and then the pilot valve core closes the pilot valve port. Compared with related technologies, in the open state of this technical solution, no axial distance needs to be reserved between the valve stem and the main valve core, or a smaller axial distance can be reserved compared to the existing technology. This is beneficial to reduce the stroke of the pilot valve core, thereby reducing the axial height of the valve device and thus realizing the miniaturization of the valve device. Attached Figure Description

[0007] Figure 1 This is a side view of the valve device provided in this application;

[0008] Figure 2 yes Figure 1 A cross-sectional view along the AA direction, showing the valve device in the open state of the first embodiment;

[0009] Figure 3 This is a cross-sectional view of the pilot valve port closing during the valve closing process in the first embodiment of the valve device.

[0010] Figure 4 This is a cross-sectional structural schematic diagram of the first embodiment of the valve device in the closed state.

[0011] Figure 5 This is a cross-sectional structural schematic diagram of the second embodiment of the valve device in the closed state of the first embodiment;

[0012] Figure 6 yes Figure 5 A magnified structural diagram at point C;

[0013] Figure 7 yes Figure 2 An enlarged structural diagram of point B, showing the seal located at the mating part;

[0014] Figure 8 This is a schematic diagram of the structure of the seal located on the wall forming the guide groove;

[0015] Figure 9 This is a cross-sectional structural schematic diagram of the second embodiment of the valve device.

[0016] Figure label:

[0017] 1. Valve seat; 10. Valve chamber; 100. Valve assembly; 101. First chamber; 102. Second chamber; 103. Pilot valve port; 104. First channel; 105. Second channel; 11. Main valve port;

[0018] 2. Valve core assembly; 20. Main valve core; 200. Guide groove; 201. Balance hole; 202. Receiving groove; 21. Valve core spring;

[0019] 3. Drive assembly; 30. Moving iron core; 31. Stationary iron core; 32. Return spring; 33. Pilot valve seat; 331. Sealing gasket; 332. Support ring;

[0020] 4. Valve stem; 40. Pilot valve core; 41. Abutment part; 42. Mating part; 43. Conducting channel; 44. Seal; 45. Valve stem body;

[0021] 5. Sleeve; 50. Pressure equalization chamber;

[0022] 6. Coil assembly. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0024] The valve device 100 of the present invention is mainly used in the field of fluid control. Specifically, the valve device 100 of the present invention can be used in vehicle air conditioning refrigeration systems or in household air conditioning refrigeration systems.

[0025] Combination Figures 1-5 The illustration shows a first embodiment of the valve device 100. In this embodiment, the valve device 100 includes a valve seat 1, a valve core assembly 2, a drive assembly 3, a valve stem 4, a sleeve 5, and a coil assembly 6. The valve seat 1 has a valve cavity 10, and the valve core assembly 2 is located in the valve cavity 10 and can move inside the valve cavity 10. The sleeve 5 is welded and fixed to the valve seat 1 to form a pressure equalization chamber 50. The drive assembly 3 is located inside the pressure equalization chamber 50. One end of the valve stem 4 is connected to the drive assembly 3, and the other end of the valve stem 4 is connected to the valve core assembly 2. The drive assembly 3 can drive the valve core assembly 2 to move through the valve stem 4. The coil assembly 6 is located above the valve seat 1 and is sleeved on the outer periphery of part of the drive assembly 3 and part of the sleeve 5. Along the axial direction of the valve device 100, at least part of the sleeve 5 is located between the coil assembly 6 and the valve seat 1.

[0026] Combination Figures 2 to 5The valve seat 1 also has a first channel 104, a second channel 105, and a main valve port 11. The valve device 100 has a pilot valve port 103. Along the axial direction of the valve device 100, the valve cavity 10 is located between the pressure equalization chamber 50 and the first channel 104. The valve cavity 10 can communicate with the first channel 104 through the main valve port 11. The main valve core 20 can close the main valve port 11. The second channel 105 communicates with the valve cavity 10. The valve cavity 10 and the pressure equalization chamber 50 can communicate through the pilot valve port 103. The first channel 104 communicates with the pressure equalization chamber 50. Specifically, along the axial direction of the valve device 100, the main valve port 11 and the first channel 104 are both located on one side end wall forming the valve cavity 10. The pilot valve port 103 is located on the other side forming the valve cavity 10. The pilot valve port 103 and the main valve port 11 are coaxially arranged. The inner diameter of the pilot valve port 103 is smaller than the inner diameter of the main valve port 12. The second channel 105 is located on the side wall forming the valve cavity 10.

[0027] Combination Figures 2 to 5 The valve core assembly 2 includes a main valve core 20 and a valve core spring 21. Along the axial direction of the valve core 20, at least a portion of the valve core spring 21 is located between the main valve core 20 and the valve port 11. One end of the valve core spring 21 abuts against the valve core 20, and the other end of the valve core spring 21 abuts against the wall forming the valve cavity 10. Specifically, in this embodiment, the valve core spring 21 is tower-shaped, with a large-diameter end and a small-diameter end. The large-diameter end of the valve core spring 21 surrounds the main valve port 11 and abuts against the bottom wall forming the valve cavity 10. The small-diameter end of the valve core spring 21 abuts against the main valve core 20. Of course, in other embodiments, the valve core spring 21 may also be a cylindrical spring or other structure capable of applying a driving force to the main valve core 20 to move it away from the main valve port 11.

[0028] Combination Figures 2 to 5 The drive assembly 3 includes a moving iron core 30, a stationary iron core 31, and a return spring 32. Along the axial direction of the drive assembly 3, one end of the return spring 32 abuts against the moving iron core 30, and the other end of the return spring 32 abuts against the stationary iron core 31. The moving iron core 30 is connected to the valve stem 4, and the valve stem 4 is connected to the main valve core 20. In this embodiment, the moving iron core 30 and the valve stem 4 are fixed by an interference fit. In other embodiments, the moving iron core 30 and the valve stem 4 can also be fixed by welding, or the moving iron core 30 and the valve stem 4 can be an integral structure.

[0029] Combination Figures 2 to 5 as well as Figure 6Furthermore, in the first embodiment of the valve device 100, in the first implementation of the pilot valve port 103, the valve device 100 also includes a pilot valve seat 33. The pilot valve port 103 is located in the pilot valve seat 33. The stationary iron core 31 is closer to the main valve core 20 than the moving iron core 30. Specifically, the stationary iron core 31 is cylindrical. One end of the stationary iron core 31 is sleeved inside the sleeve 5 and welded and sealed to the sleeve 5. The other end of the stationary iron core 31 is welded and sealed to the valve seat. Along the radial direction of the pilot valve seat 33, at least a portion of the stationary iron core 31 is located between the pilot valve seat 33 and at least a portion of the valve seat 1. The radial inner side of valve seat 1 is welded and sealed to pilot valve seat 33, and the radial outer side of stationary iron core 31 is welded and sealed to valve seat 1. The cylinder wall of stationary iron core 31, the inner wall of sleeve 5 and part of the end wall of pilot valve seat 33 form pressure equalization cavity 50. Sealing gasket 331 is riveted and fixed to support ring 332. The material of sealing gasket 331 is polytetrafluoroethylene (PTFE). Pilot valve seat 332 is welded and fixed to stationary iron core 31. In other embodiments, moving iron core 30 may be closer to main valve core 20 than stationary iron core 31, and support ring 332 may be riveted and fixed to valve seat 1 or be an integral structure.

[0030] See Figures 2 to 5 as well as Figure 6 Furthermore, in a second embodiment of the pilot valve port 103, the valve device 100 further includes a pilot valve seat 33. The pilot valve port 103 is located in the pilot valve seat 33. The stationary iron core 31 is closer to the main valve core 20 than the moving iron core 30. Specifically, the stationary iron core 31 is cylindrical. One end of the stationary iron core 31 is fitted inside the sleeve 5 and welded and sealed to the sleeve 5. The other end of the stationary iron core 31 is welded and sealed to the valve seat 1. Along the radial direction of the pilot valve seat 33, at least a portion of the stationary iron core 31 is located between the pilot valve seat 33 and at least a portion of the valve seat 1. The radial inner side is welded and sealed to the pilot valve seat 33, and the radial outer side of the stationary iron core 31 is welded and sealed to the valve seat 1. The cylinder wall of the stationary iron core 31, the inner wall of the sleeve 5, and part of the end wall of the pilot valve seat 33 form a pressure equalization cavity 50. The sealing gasket 331 and the support ring 332 are vulcanized and bonded. The sealing gasket 331 is made of rubber. The support ring 332 is welded and fixed to the stationary iron core 31. In other embodiments, the moving iron core 30 may be closer to the main valve core 20 than the stationary iron core 31, and the support ring 332 may be riveted and fixed to the valve seat 1 or be an integral structure.

[0031] Compared to the two implementations of the pilot valve port 103 mentioned above, the pilot valve seat 33 can also be riveted to the stationary iron core 31 or be an integral structure.

[0032] Combination Figure 9In other embodiments, compared with the above two embodiments of the pilot valve port 103, the difference lies in the setting position and connection method of the pilot valve seat 33. In this embodiment, the pilot valve seat 33 and the valve seat 1 are fixed by welding. In another embodiment, the pilot valve seat 33 and the valve seat 1 are riveted and fixed, or the pilot valve seat 33 and the valve seat 1 are an integral structure. With this setting, when the pilot valve core 40 closes the pilot valve port 103, the contact position between the pilot valve core 40 and the pilot valve seat 33 remains unchanged, which helps to ensure the reliability of the sealing of the pilot valve port 103.

[0033] Combination Figures 2 to 5 as well as Figure 6 The valve stem 4 includes a pilot valve core 40 and a valve stem body 45. The pilot valve core 40 is located in the pressure equalization chamber 50. The pilot valve core 40 can abut against the pilot valve seat 33, thereby closing the pilot valve port 103. The valve stem 4 can move axially relative to the main valve core 20, and the valve stem 4 can push the main valve core 20 to move towards the main valve port 11. Specifically, in this embodiment, the valve stem body 45 is located radially inside the pilot valve port 103. The inner diameter of the pilot valve port 103 is larger than the outer diameter of the valve stem body 45. The outer diameter of the pilot valve core 40 is larger than the outer diameter of the valve stem body 45. The pilot valve core 40 has an annular structure. The inner diameter of the annular pilot valve core 40 is larger than the outer diameter of the valve stem body 45. The end of the annular pilot valve core 45 away from the pilot valve seat 33 is integral with the valve stem body 40. The end of the annular pilot valve core 40 near the sealing gasket 331 can abut against the sealing gasket 331 to seal, thereby closing the pilot valve port 103.

[0034] Combination Figures 2 to 5 The valve stem 4 also includes a mating part 42, and the main valve core 20 has a guide groove 200. At least a portion of the mating part 42 is located in the guide groove 200, and at least a portion of the mating part 42 is axially movable within the guide groove 200. The mating part 42 is sealed to the wall forming the guide groove 200. Specifically, the valve device 100 also includes a sealing element 44, which is radially pressed between the mating part 42 and the wall forming the guide groove 200. With this arrangement, a sealed connection between the mating part 42 and the wall forming the guide groove 200 can be achieved while they slide relative to each other axially.

[0035] See Figure 2 , Figure 7 as well as Figure 8Furthermore, in the first embodiment of the valve device 100, in the first embodiment of the seal 44 (not shown in the figure), the seal 44 is located at the mating portion 42, the radially inner side of the seal 44 is vulcanized and bonded to the outer wall of the mating portion 42, and the radially outer side of the seal 44 abuts against the wall forming the guide groove 200, and the radially outer side of the seal 44 can slide relative to the wall forming the guide groove 200; of course, in other embodiments, the seal 44 may also be located at the wall forming the guide groove 200, the radially outer side of the seal 44 is vulcanized and bonded to the wall forming the guide groove 200, the radially inner side of the seal 44 abuts against the mating portion 42, and the radially inner side of the seal 44 can slide relative to the mating portion 42; this arrangement helps to avoid the seal 44 from twisting under the action of friction during movement, which would cause internal leakage between the mating portion 42 and the wall forming the guide groove 200.

[0036] Combination Figure 2 , Figure 7 as well as Figure 8 Furthermore, in the first embodiment of the valve device 100, in the second embodiment of the seal 44, the radial thickness of the seal 44 is greater than the axial thickness of the seal 44; this arrangement helps to prevent the seal 44 from twisting under the action of friction during movement, which would cause internal leakage between the mating part 42 and the wall forming the guide groove 200.

[0037] Combination Figure 2 , Figure 7 as well as Figure 8 Furthermore, the mating part 42 has a receiving groove 202, at least a portion of the sealing member 44 is located in the receiving groove 202, the sealing member 44 is sealed to the wall forming the receiving groove 202, and the radially outer side of the sealing member 44 is pressed against the wall forming the guide groove 200; of course, in other embodiments, the receiving groove 202 may also be located in the wall forming the guide groove 200, at least a portion of the sealing member 44 is located in the receiving groove 202, the sealing member 44 is sealed to the wall forming the receiving groove 202, and the radially inner side of the sealing member 44 is pressed against the outer wall of the mating part 42.

[0038] Combination Figures 2 to 5The valve stem 4 also includes an abutment portion 41, at least a portion of the main valve core 20 is located between the abutment portion 41 and the main valve port 11. When the valve cavity 10 is connected to the pilot valve port 103, the abutment portion 41 can axially abut against the main valve core 20. Specifically, the outer diameter of the mating portion 42 is smaller than the outer diameter of the valve stem body 45, and the abutment portion 41 is located between the valve stem body 45 and the mating portion 42. The valve device 100 includes an open valve state and a closed valve state. In the open valve state, the abutment portion 41 axially abuts against the main valve core 20, and the distance between the pilot valve core 40 and the pilot valve port 103 is smaller than the distance between the main valve core 20 and the pilot valve port 103. The distance between the main valve ports 11; in the closed state, the abutment portion 41 and the main valve core 20 have an axial distance; of course, in other embodiments, in the open state, the abutment portion 41 and the main valve core 20 may also have an axial distance; in the closed state, the abutment portion 41 and the main valve core 20 may also abut. During the valve closing process, the action of the pilot valve core 40 to close the pilot valve port 103 takes precedence over the action of the main valve core 20 to close the main valve port 11, or the action of the pilot valve core 40 to close the pilot valve port 103 and the action of the main valve core 20 to close the main valve port 11 are completed simultaneously.

[0039] Combination Figures 2 to 5 as well as Figure 9 The valve device 100 also has a conduction channel 43, which directly connects the pressure equalization chamber 50 and the first channel 104, or indirectly connects the pressure equalization chamber 50 and the first channel 104; the conduction channel 43 is used to balance the pressure between the pressure equalization chamber 50 and the first channel 104.

[0040] Combination Figures 2 to 5 In the first embodiment of the conduction channel 43, the conduction channel 43 is located on the valve stem 4. Specifically, along the axial direction of the valve stem 4, the conduction channel 43 passes through the mating part 42, the abutment part 41, and the pilot valve core 40. The two ends of the conduction channel 43 are respectively connected to the pressure equalization chamber 50 and the guide groove 200. The guide groove 200 passes through the main valve core 20 and is connected to the first channel 104. The conduction channel 43 includes a transverse channel and a longitudinal channel. The transverse channel is located in the pressure equalization chamber 50 and is directly connected to the pressure equalization chamber 50. The longitudinal channel is connected to the transverse channel and the guide groove 200 respectively.

[0041] Combination Figure 9 The second embodiment of the valve device 100 differs from the first embodiment in that the position of the conduction channel 43 is different.

[0042] In this embodiment, the conduction channel 43 is located inside the valve seat 1. Compared to the conduction channel 43 being located on the valve stem 4, the sealing element 44 can be omitted, thus avoiding internal leakage of the conduction channel 43 due to the failure of the sealing element 44. The conduction channel 43 includes two transverse channels and one longitudinal channel. The flow path of the longitudinal channel is connected to one transverse channel. One transverse channel is directly connected to the pressure equalization chamber 50, and the other transverse channel is connected to the first channel 104. Of course, in other embodiments, the conduction channel 43 can also be located inside the valve seat 1 and the sleeve 5.

[0043] Combination Figure 9 Furthermore, the second embodiment of the valve device 100 differs from the first embodiment in that: the structure of the guide groove 200 and the connection method between the mating part 42 and the wall forming the guide groove 200 are different.

[0044] In this embodiment, the mating part 42 is fitted with the wall gap forming the guide groove 200. Compared with the first embodiment of the valve device 100, this embodiment does not require the sealing element 44. With this configuration, the mating part 42 can guide the movement of the main valve core 20 during its movement, avoiding the main valve core 20 from shifting or getting stuck during its movement. At the same time, it also avoids the internal leakage of the conduction channel 43 due to aging or wear of the sealing element 44.

[0045] Combination Figures 2 to 5 as well as Figure 9 In the first and second embodiments of the valve device 100, the valve cavity 10 includes a first cavity 101 and a second cavity 102, which are located on opposite sides of the main valve core 20 along the axial direction. The main valve core 20 has a balance hole 201 that connects the first cavity 101 and the second cavity 102. The flow area of ​​the balance hole 201 and the flow area between the main valve core 20 and the wall forming the valve cavity 10 are smaller than the flow area of ​​the pilot valve port 40. The flow area of ​​the pilot valve port 40 is smaller than or equal to the flow area of ​​the conduction channel 43.

[0046] Combination Figure 2 and Figure 9In the first and second embodiments of the valve device 100, when the valve device 100 is in the open state, the pilot valve port 103 is open, the main valve port 11 is open, the pilot valve core 40 is separated from the pilot valve port 103, the main valve core 20 is separated from the main valve port 11, the abutment part 41 is always axially abutting the main valve core 20, and the main valve core 20 abuts against the top wall forming the valve cavity 10 under the elastic force of the valve core spring 21. In addition, since the sum of the flow areas of the gap between the balance hole 201, the main valve core 20 and the wall forming the valve cavity 10 is less than the flow area of ​​the pilot valve port 40, the flow area of ​​the pilot valve port 40 is less than or equal to the flow area of ​​the conduction channel 43, the pressure of the working medium inside the first cavity 101 is greater than the pressure of the working medium inside the second cavity 102, the main valve port 11 remains open, and the working medium flows from the second channel 105 through the valve cavity 10 and flows out from the first channel 104.

[0047] Combination Figure 3 and Figure 4 In the first embodiment of the valve device 100, during the valve closing process, the coil assembly 6 is energized, the moving iron core 30 and the stationary iron core 31 are attracted together, the return spring 32 is compressed, the moving iron core 30 drives the valve stem 4 to move, the pilot valve core 40 moves towards the pilot valve port 103 and closes the pilot valve port 103. During this process, the abutment part 41 pushes the main valve core 20 to move towards the main valve port 11, the valve core spring 21 is compressed, as the main valve core 20 approaches the main valve port 11, the passage for the working medium between the second channel 105 and the first channel 104 gradually narrows, the pressure inside the second channel 105 is greater than the pressure inside the first channel 104, and during this process, the pressure difference between the second channel 105 and the first channel 104 gradually increases; the pilot valve core 40 closes the pilot valve port 103. Afterwards, the second chamber 102 is closed, and the second channel 105 is connected to the second chamber 105 through the balance hole 201. That is, the pressure of the working medium inside the second chamber 102 is greater than the pressure of the working medium inside the first channel 104. In addition, according to Bernoulli's principle, the pressure is lower where the flow velocity is higher. The pressure of the working medium inside the second chamber 102 is greater than the pressure of the working medium inside the first channel 104. Under the action of the pressure difference between the second chamber 102 and the first channel 104, the main valve core 20 continues to move towards the main valve port 11 until the main valve core 20 closes the main valve port 11. At this time, the abutment part 41 separates from the main valve core 20, and the valve device 100 switches to the closed valve state. At this time, the pressure inside the second channel 105 is greater than the pressure inside the first channel 104. The main valve core 20 presses against the periphery of the main valve port 11 and closes the main valve port 11.

[0048] This configuration ensures that when the valve device 100 changes from an open valve state to a closed valve state, the axial displacement distance of the main valve core 20 along the axial direction of the valve device 100 is greater than the axial displacement distance of the pilot valve core 40. The axial displacement distance of the pilot valve core 40 is consistent with the axial displacement distance of the moving iron core 30 during the attraction process between the moving iron core 30 and the stationary iron core 31.

[0049] Compared to traditional pilot-operated solenoid valves, under the condition that the maximum flow area of ​​the main valve port 11 is the same, the valve device 100 in this technical solution can effectively shorten the distance between the moving iron core 30 and the stationary iron core 31.

[0050] On the one hand, it can reduce the axial height of the valve device 100, which is conducive to reducing the volume of the valve device 100 and realizing the miniaturization of the valve device 100.

[0051] On the other hand, it can increase the attraction force between the moving iron core 30 and the stationary iron core 31, thereby reducing the power of the coil assembly 6, reducing the volume of the coil assembly 6, and further reducing the volume of the valve device 100.

[0052] Combination Figure 4 and Figure 2 In the first embodiment of the valve device 100, when the valve device 100 switches back to the open state, the coil assembly 6 is de-energized, the reset spring 32 pushes the moving iron core 30 to separate from the stationary iron core 31, the moving iron core 30 drives the valve stem 4 to move, the pilot valve core 40 separates from the pilot valve port 103, the valve stem 4 moves relative to the main valve core 20 in the direction of the drive assembly 3, the pilot valve port 103 opens, and the working medium flows from the second channel 105 through the first valve chamber 101, the balance hole 201, the second valve chamber 102, the pilot valve port 103, and the equalizing chamber 50 into the first channel 104; When the working medium pressures inside chamber 101 and the second chamber 102 are balanced, the main valve core 20 moves away from the valve port 11 under the elastic force of the valve core spring 21. As the main valve core 20 moves away from the valve port 11, since the flow area of ​​the balance hole 201 is smaller than the flow area of ​​the pilot valve port 40, and the flow area of ​​the pilot valve port 40 is smaller than or equal to the flow area of ​​the conduction channel 43, the pressure of the working medium inside the first chamber 101 gradually becomes greater than the pressure of the working medium inside the second chamber 102. The main valve port 11 remains open, and the working medium flows from the second channel 105 through the valve chamber 10 and out of the first channel 104.

[0053] Combination Figure 5 ,refer to Figure 3The second embodiment of the valve device 100 differs from the first embodiment of the valve device 100 in that, in this embodiment, during the process of the abutment part 41 pushing the main valve core 20 to move in the direction of the main valve port 11, while the pilot valve core 40 and the sealing gasket 331 abut against and close the pilot valve port 103, the abutment part 41 pushes the main valve core 20 to close the main valve port 11. That is, when the valve device 100 is switched to the closed valve state, the abutment part 41 always presses against the main valve core 20.

[0054] This configuration ensures that when the valve device 100 changes from an open valve state to a closed valve state, the axial displacement distance of the main valve core 20 along the axial direction of the valve device 100 is equal to the axial displacement distance of the pilot valve core 40. The axial displacement distance of the pilot valve core 40 is consistent with the axial displacement distance of the moving iron core 30 during the attraction process between the moving iron core 30 and the stationary iron core 31.

[0055] Compared to traditional pilot-operated solenoid valves, under the condition that the maximum flow area of ​​the main valve port 11 is the same, the valve device 100 in this technical solution can effectively shorten the distance between the moving iron core 30 and the stationary iron core 31.

[0056] On the one hand, it can reduce the axial height of the valve device 100, which is conducive to reducing the volume of the valve device 100 and realizing the miniaturization of the valve device 100.

[0057] On the other hand, it can increase the attraction force between the moving iron core 30 and the stationary iron core 31, thereby reducing the power of the coil assembly 6, reducing the volume of the coil assembly 6, and further reducing the volume of the valve device 100.

[0058] In the operation of the valve device 100 of the present invention, a specific working medium is a refrigerant. During the operation of the valve device 100, the working medium flowing through the valve device 100 has a certain pressure. The pressure of the working medium is sufficient to overcome the spring force of the valve core spring 21, thereby driving the main valve core 20 to keep the main valve port 11 closed, ensuring the valve device 100 is in the closed state.

[0059] The valve device 100 of the present invention is used in environments with strong vibrations, such as vehicle refrigeration systems. Since the position of the pilot valve seat 33 of the valve device 100 of the present invention is fixed, when the refrigeration system vibrates, the pilot valve core 40 and the pilot valve seat 33 are not prone to relative shaking, that is, the pilot valve core 40 seals the pilot valve port 103 more reliably.

[0060] The technical features of the above-described embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features of the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this description.

[0061] It should be noted that the above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still make modifications or equivalent substitutions to the present invention. All technical solutions and improvements that do not depart from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. A valve device, characterized by The valve device (100) has a valve cavity (10), a first channel (104), a main valve port (11), a pilot valve port (103), a pilot channel (43) and an equalizing cavity (50); Along the axial direction of the valve device (100), the valve cavity (10) is located between the equalizing cavity (50) and the first channel (104), the valve cavity (10) can communicate with the first channel (104) through the main valve port (11), the valve cavity (10) can communicate with the equalizing cavity (50) through the pilot valve port (103), the pilot channel (43) has an opening communicating with the equalizing cavity (50), and the pilot channel (43) has an opening communicating with the first channel (104); The valve device (100) comprises a pilot spool (40), a valve stem (4) and a main spool (20), the pilot spool (40) is located in the equalizing cavity (50), the valve stem (4) is fixedly connected with the pilot spool (40) or is an integral structure, the pilot spool (40) can open and close the pilot valve port (103), and the main spool (20) can move in the valve cavity (10) and open and close the main valve port (11); At least part of the valve stem (4) is located in the pilot valve port (103), and the valve stem (4) can move axially relative to the main spool (20); When the valve cavity (10) communicates with the equalizing cavity (50) through the pilot valve port (103), the valve stem (4) can push the main spool (20) to move towards the main valve port (11).

2. The valve device according to claim 1, characterized in that The valve stem (4) comprises an abutting portion (41), and at least part of the main spool (20) is located between the abutting portion (41) and the main valve port (11); When the valve cavity (10) communicates with the equalizing cavity (50) through the pilot valve port (103), the abutting portion (41) axially abuts against the main spool (20).

3. Valve device according to claim 1 or 2, characterized in that The valve stem (4) comprises an abutting portion (41), and at least part of the main spool (20) is located between the abutting portion (41) and the main valve port (11); The valve device (100) comprises a closed valve state: the pilot spool (40) closes the pilot valve port (103), the main spool (20) closes the main valve port (11), the abutting portion (41) axially abuts against the main spool (20), or the abutting portion (41) has an axial spacing with the main spool (20).

4. Valve device according to any of claims 1-3, characterized in that The main spool (20) has a guide groove (200) axially penetrating the main spool (20), the guide groove (200) communicates with the first channel (104), the valve stem (4) further comprises a matching portion (42), at least part of the matching portion (42) is located in the guide groove (200), the matching portion (42) can move axially relative to the wall forming the guide groove (200), and the matching portion (42) is in sealing connection with the wall forming the guide groove (200). The through channel (43) is located in the valve stem (4), and the through channel (43) has an opening on the side wall of the valve stem (4) located in the pressure equalizing cavity (50), and the through channel (43) has an opening on the axial end wall of the matching part (42) and communicates with the guide groove (200).

5. The valve device of claim 4, wherein The valve stem (4) comprises a valve stem body (45) fixedly connected with the pilot valve core (40) or in an integrated structure, at least part of the valve stem body (45) is located radially inside the pilot valve port (103), the outer diameter of the valve stem body (45) is greater than the outer diameter of the matching part (42), and the stepped wall between the valve stem body (45) and the matching part (42) is the abutting part (41).

6. The valve device of claim 4, wherein The valve device (100) further comprises a sealing member (44) radially compressed between the matching part (42) and the wall forming the guide groove (200); The sealing member (44) is located in the matching part (42), or the sealing member (44) is located in the wall forming the guide groove (200).

7. The valve device of claim 6, wherein The radial thickness of the sealing member (44) is greater than the axial thickness of the sealing member (44); The matching part (42) has a receiving groove (202), at least part of the sealing member (44) is located in the receiving groove (202), the sealing member (44) is sealingly connected with the wall forming the receiving groove (202), and the radially outer side of the sealing member (44) is compressed against the wall forming the guide groove (200); Or, the wall forming the guide groove (200) has a receiving groove (202), at least part of the sealing member (44) is located in the receiving groove (202), the sealing member (44) is sealingly connected with the wall forming the receiving groove (202), and the radially inner side of the sealing member (44) is compressed against the outer wall of the matching part (42).

8. The valve device of claim 6, wherein The radially inner side of the sealing member (44) is vulcanized and bonded with the outer wall of the matching part (42), and the radially outer side of the sealing member (44) abuts against the wall forming the guide groove (200); Or, the radially outer side of the sealing member (44) is vulcanized and bonded with the wall forming the guide groove (200), and the radially inner side of the sealing member (44) abuts against the matching part (42).

9. Valve device according to any of claims 1-3, characterized in that The valve device (100) comprises a valve seat (1), the through channel (43) is located in the valve seat (1), the first channel (104) is located in the valve seat (1), and at least part of the pressure equalizing cavity (50) is located in the valve seat (1); The through channel (43) has an opening on the side wall forming the pressure equalizing cavity (50), and the through channel (43) has an opening on the side wall forming the first channel (104).

10. The valve device of claim 9, wherein The main valve core (20) has a guide groove (200), and the valve stem (4) further comprises a matching part (42), at least part of the matching part (42) is located in the guide groove (200), and the matching part (42) can guide the movement of the wall forming the guide groove (200).

11. Valve device according to claims 4-10, characterized in that The valve cavity (10) comprises a first cavity (101) and a second cavity (102), the first cavity (101) and the second cavity (102) are located on both axial sides of the main valve core (20); The main valve core (20) has a balance hole (201) which communicates the first cavity (101) and the second cavity (102), the flow area of the balance hole (201) is smaller than the flow area of the pilot valve port (40), and the flow area of the pilot valve port (40) is smaller than or equal to the flow area of the pilot passage (43).

12. Valve device according to any of claims 1-11, characterized in that The valve device (100) further comprises a valve core spring (21); Along the axial direction of the main valve core (20), at least part of the valve core spring (21) is located between the main valve core (20) and the valve port (11), one end of the valve core spring (21) abuts against the main valve core (20), and the other end of the valve core spring (21) abuts against the wall forming the valve cavity (10).

13. Valve device according to claims 1-12, characterized in that The valve device (100) comprises a pilot valve seat (33) located between the valve cavity (10) and the pressure equalizing cavity (50), and the pilot valve port (103) is located in the pilot valve seat (33). The outer diameter of the pilot valve core (40) is greater than the outer diameter of the valve stem body (45), and the pilot valve core (40) can axially abut against the pilot valve seat (33) to close the pilot valve port (103).

14. The valve device of claim 12, wherein The valve device (100) further comprises a valve seat (1) and a driving assembly (3), the driving assembly (3) comprises a moving iron core (30) and a static iron core (31), and the static iron core (31) is cylindrical; The moving iron core (30) is located in the pressure equalizing cavity (50), and the moving iron core (30) is fixedly connected, limitingly connected or integrated with the valve stem (4), and at least part of the valve stem (4) is located radially inside the static iron core (31); Along the radial direction of the pilot valve seat (33), at least part of the valve seat (1) is located radially outside the pilot valve seat (33), and the pilot valve seat (33) is sealingly connected with the valve seat (1); Alternatively, along the radial direction of the pilot valve seat (33), at least part of the static iron core (31) is located between the pilot valve seat (33) and at least part of the valve seat (1), the radially inner side of the static iron core (31) is sealingly connected with the pilot valve seat (33), and the radially outer side of the static iron core (31) is sealingly connected with the valve seat (1).

15. Valve device according to any of claims 12 or 13, characterized in that The pilot valve seat (33) comprises a sealing gasket (331) and a support ring (332); The sealing gasket (331) and the support ring (332) are fixedly connected, or the sealing gasket (331) and the pilot valve core (40) are fixedly connected; The support ring (332) is riveted, welded or integrated with the valve seat (1), or the support ring (332) is riveted, welded or integrated with the static iron core (31).

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